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Figure 6


Fig. 6. Identification of outer dorsal fin vortex in the wake. (A) Two vortices above the upper margin of the caudal fin in a plane approximately 5 mm downstream of the tail, shown by a thick black line. The caudal fin vortex appeared first and is clearly a tip vortex from the caudal fin. The lower vortex, labeled `dorsal fin vortex', appears later. (B) Plot of the circulations of three vortices against tail beat phase. Red line, outer dorsal fin vortex as it is formed on the dorsal fin at z{approx}0.7L; broken blue line, lower vortex in (A) at z{approx}L; thin black line, caudal fin tip vortex (upper vortex in A), at z{approx}L. Black bars indicate the length of time it would take flow to pass from the posterior margin of the dorsal fin to the tip of the tail, positively identifying the blue trace as the outer dorsal fin vortex. Dotted vertical line indicates the time of A.





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